The JBX05667 4m 100GBASE-CR4 QSFP28 Passive Direct Attach Copper Cable represents a critical infrastructure component for modern high-speed data center and enterprise networks. Engineered to deliver 100 gigabit per second (100GB) Ethernet connectivity, this cable bridges the gap between network switches, transceivers, and line cards with exceptional reliability and performance. **Superior Construction & Design** This passive DAC cable features precision-engineered 26AWG twinax copper conductors that minimize signal degradation over the 4-meter distance. The durable plastic jacketing provides mechanical protection while maintaining flexibility for installation in confined spaces. Unlike active cables, the passive design requires no power supply, reducing operational costs and system complexity while eliminating potential failure points. **Technical Excellence** Fully qualified to IEEE 802.3bj specifications and QSFP28 Multi-Source Agreement (MSA) standards, the JBX05667 guarantees industry-standard compatibility. The cable utilizes QSFP28 connectors on both ends, enabling seamless integration with Arista-compatible networking equipment and switches. Operating across the full industrial temperature range (0-70°C / 32-158°F), it performs reliably in various environmental conditions. **Compliance & Certification** The cable meets stringent safety and environmental requirements including RoHS/ELV directive compliance, TUV certification, and UL safety standards. These certifications ensure suitability for enterprise deployments, data center facilities, and regulated network environments. **Ideal Applications** Perfect for connecting high-density switch fabrics, direct server attachments, and high-performance computing clusters. The 4-meter length accommodates typical rack-to-rack deployments and equipment spacing in standard data center layouts. **Reliability & Support** Backed by a 90-day limited warranty and available for custom brand programming. Ships from strategically located U.S. facilities (Danville, CA and Beaufort, SC) with free standard shipping on orders over $99. A direct replacement for Arista part number CAB-Q-Q-100G-4M, ensuring plug-and-play compatibility with existing infrastructure.